253 citations · 1.9k across the 111 of their papers we have counts for
119 papers
Strong primordial inhomogeneities of axion-like field in Einstein-Gauss-Bonnet gravity
M. A. Krasnov, D. Z. Berkimbayev, A. Addazi +2
In this paper we consider complex scalar field with Mexican hat potential coupled with Gauss-Bonnet scalar resulting in restored U(1) symmetry at the stage of inflation, correspond…
olographic aturalness and Pre-Geometric Gravity
Andrea Addazi, Salvatore Capozziello, Giuseppe Meluccio
The cosmological constant (CC, ) problem represents a remarkable discrepancy of about 120 orders of magnitude between the observed dark energy and its natural expectation from q…
Machine Learning for Multi-messenger Probes of New Physics and Cosmology: A Review and Perspective
Andrea Addazi, Konstantin Belotsky, Vitaly Beylin +18
The multi-messenger exploration of dark matter and physics beyond the Standard Model has emerged as a central direction in modern astro-particle physics, particularly following the…
Emergent Gravity from a Spontaneously Broken Gauge Symmetry: a Pre-geometric Prospective
Andrea Addazi
We explore the paradigm of pre-geometric gravity, where spacetime geometry and the gravitational field are not fundamental but emerge from the spontaneous symmetry breaking (SSB) o…
(Lovelock) inflation: explaining the ACT data and equivalence to Higgs-Gauss-Bonnet inflation
Andrea Addazi, Yermek Aldabergenov, Daulet Berkimbayev +1
We revisit the Starobinsky model of inflation in light of recent data from the Atacama Cosmology Telescope (ACT), which indicates a potential preference for a slightly larger scala…
Domain Wall formation from spontaneous symmetry breaking/restoration in Scalar-Einstein-Gauss-Bonnet theory
Maxim Krasnov, Daulet Berkimbayev, Andrea Addazi +2
This study offers a detailed analysis of domain wall formation and its cosmological consequences in Einstein-Gauss-Bonnet gravity coupled to a scalar field. A central aspect of the…
Exotic PeVatrons as sources of ultra-high-energy gamma rays
Andrea Addazi, Salvatore Capozziello, Qingyu Gan
We explore novel classes of exotic astrophysical sources capable of producing ultra-high-energy gamma rays extending beyond the PeV scale, motivated by quantum gravity scenarios an…
Emergent Gravity from Topological Quantum Field Theory: Stochastic Gradient Flow Perspective away from the Quantum Gravity Problem
Andrea Addazi, Salvatore Capozziello, Jinglong Liu +3
We propose a scenario according to which the ultraviolet completion of General Relativity is realized through a stochastic gradient flow towards a topological BF theory. Specifical…
Curvature corrections to Starobinsky inflation can explain the ACT results
Andrea Addazi, Yermek Aldabergenov, Sergei V. Ketov
We investigate the impact of curvature corrections to Starobinsky inflation in light of the latest observational results from the Atacama Cosmology Telescope (ACT). While the pure…
Hamiltonian Analysis of Pre-geometric Gravity
Andrea Addazi, Salvatore Capozziello, Antonino Marcianò +1
The Einstein-Cartan theory of gravity can arise from a mechanism of spontaneous symmetry breaking within the context of pre-geometric gauge theories. In this work, we develop the H…
Excess Radiation from Axion-Photon Conversion
Andrea Addazi, Salvatore Capozziello, Qingyu Gan +2
Two notable anomalies in radio observations -- the excess radiation in the Rayleigh-Jeans tail of the cosmic microwave background, revealed by ARCADE2, and the twice-deeper absorpt…
Gravity from Pre-geometry
Andrea Addazi, Salvatore Capozziello, Antonino Marciano +1
The gravitational interaction, as described by the Einstein-Cartan theory, is shown to emerge as the by-product of the spontaneous symmetry breaking of a gauge symmetry in a pre-ge…
Secondary Gravitational Waves in Non-local Starobinsky inflation
Andrea Addazi, Alexey S. Koshelev, Shi Pi +1
We show how infinite derivative modifications of gravity impact on the stochastic background of Gravitational Waves from early Universe. The generic property of the ghost-free theo…
Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation
Andrea Addazi, Yermek Aldabergenov, Yifu Cai
We demonstrate the occurrence of Sound Speed Resonances (SSR) in Gauss-Bonnet-coupled inflation across a wide range of coupling functions and parameters. After inflation, the dampe…
Superoscillations in High Energy Physics and Gravity
Andrea Addazi, Qingyu Gan
We explore superoscillations within the context of classical and quantum field theories, presenting novel solutions to Klein-Gordon's, Dirac's, Maxwell's and Einstein's equations.…
Resonant Graviton-Photon Conversion with Stochastic Magnetic Field in the Expanding Universe
Andrea Addazi, Salvatore Capozziello, Qingyu Gan
We investigate graviton-photon oscillations sourced by cosmological magnetic fields from Gertsenshtein effect. We adopt a robust perturbative approach and we find that the conversi…
Have pulsar timing array methods detected a cosmological phase transition?
Andrea Addazi, Yi-Fu Cai, Antonino Marciano +1
We show that the recent detection of a gravitational wave (GW) background reported by various pulsar timing array (PTA) collaborations including NANOGrav-15yr, PPTA, EPTA, and CPTA…
Gravitational echoes of lepton number symmetry breaking with light and ultralight Majorons
Andrea Addazi, Antonino Marcianò, António P. Morais +3
We formulate a version of the low-scale Majoron model equipped with an inverse seesaw mechanism featuring lepton-number preserving dimension-6 operators in the scalar potential. Co…
Black hole shadow and chaos bound violation in teleparallel gravity
Andrea Addazi, Salvatore Capozziello
We show that the so-called chaos bound, proposed by Maldacena, Shenker, and Stanford, can be violated in teleparallel gravity. In particular, it is possible to select a new…
Experimental test of Non-Commutative Quantum Gravity by VIP-2 Lead
Kristian Piscicchia, Andrea Addazi, Antonino Marciano +18
Pauli Exclusion Principle (PEP) violations induced by space-time non-commutativity, a class of universality for several models of Quantum Gravity, are investigated by the VIP-2 Lea…
More on gravitational waves from double monodromy inflation
Medeu Abishev, Aigerim Abylayeva, Andrea Addazi +2
We further analyze phenomenological implications of double axion monodromy inflation proposed in Ref. Phys. Rev. D 104, L081302 (2021), in gravitational wave physics. We show that…
Strongest atomic physics bounds on Non-Commutative Quantum Gravity Models
Kristian Piscicchia, Andrea Addazi, Antonino Marciano +18
Investigations of possible violations of the Pauli Exclusion Principle represent critical tests of the microscopic space-time structure and properties. Space-time non-commutativity…
Dark Energy and Neutrino Superfluids
Andrea Addazi, Salvatore Capozziello, Qingyu Gan +1
We show that the neutrino mass, the dark matter and the dark energy can be explained in a unified framework, postulating a new invisible Born-Infeld field, which we name "non-linea…
Inflation, SUSY breaking, and primordial black holes in modified supergravity coupled to chiral matter
Yermek Aldabergenov, Andrea Addazi, Sergei V. Ketov
We propose a novel model of the modified (Starobinsky-like) old-minimal-type supergravity coupled to a chiral matter superfield, that can {\it simultaneously} describe multi-field…